How old was the peroxide you used? turn off the light after you dose the peroxide since light can quickly break down peroxide. You don't have to do water change after dosing peroxide since it quickly convert to water and oxygen.

I just tried spot treating my algae, what I believe is staghorn as well, with H2O2 so we will see what happens. I dosed about 70ml into my 75g tank in the affected spots and got some bubbling but no "Melting" of the algae what-so-ever. I had the filters off and waited almost an hour before turning them back on.

Hoping this will help, but if not I am upping my dose to 140ml and the waiting time to 2 hours and see if that will nuke it. My glosso is starting to get taken over as well as my java ferns. I tried this dose the same way about 3 days ago and didnt not see much change so hoping this one will do more. Def got more bubbling this time tho.

Maybe staghorn is too stubborn for the H2O2 treatment? I sure hope not!

I feel like an idiot, but I thought I should post my experience whether or not things are said about my stupidity.

I decided today to dose H2O2 as I have been trying to rid my tank of several algae types. I thought a 10ml per gallon "bath" was my way to go. So, no I didn't read through the whole thread before I attempted this. Today is my 50% WC day. After I removed the water, I added the peroxide. Was going to let it sit for an hour, but after about 30 min I noticed my fish were coming up a lot to get air (cory and oto), and a group of them were breathing at the surface (rasbora and neon). I promptly added my prime and then refilled the tank. I had to leave and was gone for a few hours. Came home to 4 dead rasbora, one dead neon, and I have lost 2 otos. I have other otos that are almost out of the tank, sliding up and out of the tank at the water level. I have them now in my QT tank and I performed another 50% wc.

I would rather live with algae than kill my fish. So far, all of the cory are ok. They have still been coming up for air, there are bubbles in the water, tiny ones. Not sure if that is CO2 or H2O2, as my plants are pearling from the water change.

Lately, I've been pulling my potted plants out of my outdoor emersed tank and my Whiskey Barrel pond to treat H2O2 with a spray bottle. I give the treated pot/plant 1-3min. "sizzle" time. Then either back in the pond or in a rinse bucket then back into the emerged tank. So, far this has been very successful.

If one had like Java or Anubius in a drift wood or Rock in their tank this idea would work, better I think, than spot treatments or water column dosing.

The big CAUTION point is the DWELL TIME.

I do 3min. on Emersed Crypts, less on Submersed plants.

All new plants (Buy/Trade) get misted for a 1min. before they go into any of my tanks.

I used H2O2 to try to get rid of a white fuzzy fungus on my emersed Hemianthus Callitrichoides and the only thing i got was whitered leaves and the fungus laughing at me, using a 3% H202 solution sprayed all over..

I guess H202 wont deal with fungus but is still hard on small plants :/

I'm looking to deal with hair alge on some stem plants. They are getting too tall so will be doing a trim and replanting anyhow, so was thinking about a spray, rinse and replant.
Will a H202 spray for 1-2 min harm the plants if they are at the same time trying to re-establish roots (i.e trimmed, and being replanted).
Is the recommendation, to spray, then manually remove the hair algae, or just rinse and put it back in the tank?
thanks in advance for your advice...

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